Method of rolling ribbed bars.



PATNTEDMAR. '17, 1908. T. w. JBNKS. METHOD OF ROLLING RIBBED BARS.

APPLICATION FILED APR. 2, 1907.

2 SHIJBT8-SHBBT l.

I L I I 1 I WITN ESSES H m 882,321. PATENTED MAR. 17, 1908.

T. W. JBNKS. METHOD OF ROLLING RIBBED BARS.

APPLICATION FILED APR. 2, 1907.

2'SUEETSSHEET 2.

WITNESSES INVENTOR THOMAS W. JENKS, OF AVALON, PENNSYLVANIA.

METHOD OF ROLLING BIBBED BARS.

Specification of Letters Patent.

Patented March 17, 1908.

Application filed April 2,1907. Serial No. 365,931.

To all whom it may concern:

Be it known'that I, THOMAS W. JENKs, of Avalon, Allegheny county,Pennsylvania,

- have invented a new and useful Method of Rolling Ribbed Bars, of whichthe following is a full, clear, and exact description, reference beingbad to the accompanying drawings, forming part of this specification, inwhich Figures 1, 2 and 3 are views illustrating the three successivepasses used in my method of rolling ribbed bars; Figs. 1 ,2" and 3 areerspective views showing portions of the ars, as they leave therespective passes of.

Figs. 1 2 and 3. the finished bar. I

My invention has relation to a novel method of forming metal bars foruse in concrete reinforcement, and more particularly to a method ofrolling bars'having two or more continuous longitudinalribs orprojections, with bracing ribs or projections connectingthelongitudinal'ribs or projections and forming a series of pockets ordepres- 'sions for bonding the concrete to the bar.

Priorto my invention it has not been considered'practicable or possibleto roll a bar of this form, owing to the difficulty of forming thecontinuous longitudinally-extending ribs or rojections and the cross orconnecting projections; 'and my invention consists in the method wherebythis object is successfully and commercially accomplished-- Inaccordance with my invention, I take a billet of approximatelyrectangular .cross section and pass it through a pair of rolls having apass such as shown in Fig. -1 which Fig. 4 is a cross-section ofreceives the billet in a diagonal position.

This ass has a horizontal dimension greater than Its vertical dimension,so that the billet as it passes therethrough is somewhat llattened intoa cross. section oi diamond or lozcnge form, as shown in Fig. 2 theopposite horizontal angles or corners being by the same 0 erationprovided with continuous longitut inally-extending ribs or projections2, as shown in Fig. 2, due to the lateral llow of the metal.

The bar or blank is next entered into a roll pass having the form shownat 3 in Fig. 2, and in which the vertical axis or dimension of the blankis furtherreduced, and its horizontal axis or dimension is increased,the longitudinal ribs .or projections 2 being further extended anddeveloped. This pass is also provided with the roll grooves -l whichform corresponding ribs or projections at the upper and lower corners ofthe bar, as shown 1n Figs. 2 and 2.

The bar is next entered into the third and finishing pass, shown in Fig.3, being introduced in this pass with its greatest dimenslon extendingvertically. T his pass which is shown at 6 in Fig. 3 is of approximatelyrectangular cross-sectlon.

The pass-forming groove 1n each roll 1s of V form with circumferentialgrooves 7 at Its bottom similar to the groove 4 of Fig. 2, and bothsides of the pass are formed with the cross grooves 8 which extend intothe circumferential groove. In this pass, the previously-formed ribs orprojections 2 engage the circumferential grooves 7, and the verticalaxis is reduced, while the horizontal axis is increased, the excess ofmetal provided by the reduction of the vertical axis being forcedoutwardly into and. filling the cross grooves 8 of the ass, to therebyform the bracing ribs 9 of Figs. 3 and 4. In this final pass, thelongitudinally-extending ribs or projections 2 are finished by thecircumerential grooves 7 of the pass, while the other two ribs orprojections 5 are finished by the lateral flow of the metal between theointsof the rolls.

The advantages of my invention result from the fact that by the methoddescribed T provide in the first and second passes such a disposition ofthe metal in the blank that in the final or finishing-pass an excess isprovided which is caused by the vertical. pressure of the rolls to flowlaterally into and completely fill the cross grooves, to thereby formthe connecting ribs. That is to say, instead of rolling depressions inthe surfaces of the blank, I positively force the metal outward andlaterally to form these ribs. In

this manner, I am able to preserve the "confect and mechanical bond foruniting the' concrete to the bar.

While I have shown and described my improved method in connection withthe formation of a finished bar having an approximately rectangularshape, it will be obvious.

i first-named ribs or projections; substantially that the invention isnot limited thereto, but

ofjwdiamond" or lozenge shape in cross-section with acontinuous ri-b'fo'r projection at each of its angles, and having one of its axes or.dimensions reater than the other, and then rolling said lank between dierolls to effect a reduction 1n which its axes are approximatelyequalized, and the excess of metal is caused to flow laterallyto formribs or projections at substantially right angles tothe as described.

,2. The "'gmethod of shaping metal bars,

which consists in rolling a blank of lozenge or diamond shape 1ncross-section to increase one ofits dimens ons 'and reduce its otherdimen'sion,.andcausing the excess of metal to flow laterallyintocross-grooves which are in the walls forming the passes of the rollsso as to form ribs or rojeotions extending approximately at rig t anglesto the longitudi- .fnal axis of the bar substantiallyas described. 3.The method of forming metal bars having longitudinally-extending ribs orprojections at its angles, and other ribs or projections connecting thesame at approxiv mately right angles, which consists in forming a blankor shape of diamond or lozenge form in cross-section, with one of itscross axes or dimensions greater. than the other, and having acontinuous longitudinally-extending rib or project on at each of itsangles, and then rolling said shape between A die rolls to approximatelyequalize its two v -metal laterally outward between the longi-'described.

axes or dimensions, and force the excess of tudinal projections atrecurring intervalsin the form of connecting ribs; substantially as 4.The method of formin metal bars having transversely ribbed sur aces,which consists' in rolling a blank of diamond shape in grooves in thewalls of the roll passes so as to form successive spacedribs;substantially as described.

5. The method of rolling ribbed bars, consisting in forming a blank ofsubstantial lozenge shape with at least two longitudinal ribs at itscorners or angles, and having one axis greater than the other, and thenreducing one of its axes and increasing-the length of the other betweenrolls having grooved portions in thewalls, which form the sides of theroll passes, and thereby forming crossribs or projections thereon insaid pass; substantially as described.

6. The method of forming a bar having a body portion and projectingportions integral therewith, which consists in utilizing a blank havinga cross-axis longer than the corresponding axis of'the bar to be formedtherefrom, and a second cross-axis which is substantially at rightangles to the first mentioned cross-axis of a length which is less thanthe corresponding cross-axis through the body and projecting portions ofthe aforesaid bar, subjecting the said blank to the action of rolls,having grooved passes between them and recessed portions inthe wallswhich form the sides'of the roll asses, in sucha way that the cross-axiso the said blank is reduced while the length of its second cross axis isincreased and simultaneouslytherewith the metal is forced laterally intothe said recessed portions; substantially as described In testimonywhereof, I have hereunto set my hand THOMAS W. JENKS. Witnesses:

GEo. B. BLEMING, JOHN MILLER.

